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<I>Castanea Sativa</I>

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<I>Castanea Sativa</I> MYCOTAXON Volume 107, pp. 343–347 January–March 2009 A new Marasmius on Castanea sativa from Turkey Mustafa Işıloğlu1, Hakan Allı1, M. Halil Solak2 & Roy Watling 3 isiloglu48@ gmail.com, [email protected], [email protected] & [email protected] 1Muğla University, Faculty of Science and Arts, Biology Department 48170, Muğla, Turkey 2Muğla Universty, Ula Ali Koçman Vocational High School, Program of Fungi 48640 Ula, Muğla, Turkey 3Caledonian Mycological Enterprises Edinburgh, Scotland, United Kingdom Abstract — Marasmius castaneophilus, a new agaric (Marasmiaceae, Agaricales, Basidiomycota) growing on sweet chestnut husks in Turkey, is described and illustrated. Its taxonomic position within the genus is discussed. Key Words — new taxa, biodiversity, Turkish macromycota Introduction Marasmius is a very large genus with as many as 1695 taxa (Anon 2008), even after being critically circumscribed by the transfer of some taxa to Collybia, Gymnopus, Marasmiellus and Setulipes. It is predominantly tropical in distribution (Singer 1986), with forty-two species now known from Europe (Antonin & Noordeloos 1993). The species within this restricted concept are often highly specific as to their host requirements. This specificity is not only to the host, but to a particular part of the host colonized, whether it be leaf lamina, midrib or petiole (Watling 1982). Traditionally the genus was split into those with pileipellis in the form of Rameales-structure, viz. cutis of diverticulate hyphae, and setiform stipe (sect. Androsacei Kühner, = Setulipes Antonín) and those with a hymeniform pileipellis (other Marasmius sections). As traditionally accepted, the genus ∗ corresponding author This article is dedicated to Dr. Fadime Yılmaz (1971-2005), Muğla University, who made many contributions to our knowledge of Turkish macrofungi (including members of the genus Marasmius) but, sadly, died in a car accident in 2005. 344 ... Işıloğlu & al. Marasmius contains a group of white or pale coloured, small fruitbodies usually characterized as having an insititious stipe and well-developed cystidia and referred to sect. Epiphylli Kühner. European representatives of this section include M. epiphylloides, M. epiphyllus, M. hellebori-corsici, M. saccharinus, M. setosus, and M. tremulae (= M. favrei). However, molecular studies place this section not in Marasmius s. str., but rather close to the Physalacriaceae (Owings & Desjardin 1997, Moncalvo et al. 2002, Wilson & Desjardin 2005), restricting the genus Marasmius only to representatives of the sections Marasmius, Sicci, Globulares, Hygrometrici, Neosessiles and Leveilleani. Recent studies in Turkey have encountered an additional member of the group related to M. epiphylloides that is apparently confined to colonizing the husks of Castanea sativa. The species described formally below raises the total number of members of Marasmius in Turkey to 23 (Solak et al. 2007). Taxonomic description Marasmius castaneophilus Işıloğlu, Allı, Solak & Watling, sp. nov. Figs. 1–5 Mycobank MB511864 Pileus 4–4.5 mm convexus vel plano-convexus prostremo plano, interdum depressus, albus, radiato-striatus vel radiato-sulcatus ad marginem interdum undulato-lobatus. Lamellae lato-adnatae, distantes, furcatae, plicatae, albae. Stipes 20–30 × 0.5–1 mm., filiformes vulgo flexuosus, glabrus, ad apicem hyalinum prostremo ad basim rufo-brunneum, vulgo senecutate infra atro-ferrugineus. Caro albo. Odor, sapor nullus. Sporae 10–12 × 4–5 µm, ellipsoideo-oblongae vel fusiformae, laevae, hyalinae, inamyloideae. Basidia 45–50 × 4–6 µm, 4-sporigera. Cystidia faciei lamellarum fusiformia vel clavata, tenuio-tunicata; cystidia aciei lamellarum 1) 30–40 × 5–8 µm, subfusiformia vel lageniformia et 2) 15–35 × 15–20 µm, clavata vel pyriformia ornamentiae. Cellulae cuticulae pilei hymeniformae 1) 15–18 × 8–10 µm, clavata, tenuio-tunicata – ‘rotalis-typus’ et 2) 20–27 × 4–5 µm, fusiformiae vel lageniformiae, tenuio-tunicata, laevae. Hyphae fibulatae. Trama inamyloideae. Ad Castanea sativa cupulus. Turkey; İzmir, Ödemiş Typus Ha 2842 in E. Pileus 4–4.5 mm, convex to plano-convex then irregularly applanate, sometimes depressed, white, radially striate or grooved with undulating margin (Fig. 1). Gills broadly adnate, poorly developed, distant, vein-like, forked, plicate and without lamellulae, always white. Stipe 20–30 × 0.5–1 mm., hair-like, central, rarely eccentric, glabrous, smooth, twisted when dry, stiff and tough, hyaline when young, reddish brown below when old, blackish brown when dry. Flesh very thin and white. Smel and taste indistinct. Spore print White. Spores 10–12 × 4–5 µm, fusiform to narrowly ellipptic with a long apiculus (Fig. 2), smooth, thin-walled, colourless in alkali, inamyloid. Basidia 45–50 × 4–6 µm, clavate, hyaline, thin-walled, 4-spored, with clamps. Basidioles 35–40 × 4–5 µm, clavate, with clamps. Pleurocystidia 40–70 × 9–12 µm, fusiform to clavate, thin-walled and hyaline (Fig. 3). Cheilocystidia of two types; 1. type: 30–40 × 5–8 µm subfusiform to lageniform with long neck, thin-walled (Fig. Marasmius castaneophilus sp. nov. (Turkey) ... 345 Fig. 1. Marasmius castaneophilus (from holotype; photo by H.Allı) 4). 2. type: 15–35 × 15–20 µm, broom cells of the rotalis-type, broadly clavate to pyriform with projections. Pileipellis hymeniform, a mixture of three types of elements. 1) 15–18 × 8–10 µm, clavate, thin-walled, rotalis-type cells with long projections 2) smooth clavate cells and 3) 20–27 × 4–5 µm, fusiform or lageniform, thin-walled and smooth (Fig. 5); the former the most common. Clamp-connections present. Chemical reactions. No part of basidiome dextrinoid or amyloid. Habitat. In clusters on dead husks of Castanea sativa. Specimen examined. Turkey; İzmir, Ödemiş, Elmabağı village, in natural forest of mixed Pinus nigra and Castanea sativa, 11 November 2007, Ha 2842. Holotype: in E. Discussion Marasmius castaneophilus is easily recognized in the field by its unique habitat on sweet chestnut husk, pure white pileus surmounting a stipe that becomes red brown upwards with age, lanceolate pileocystidia, and large basidiospores. Following Antonín & Noordeloos (1993), this species belongs to sect. Epiphylli subsect. Epiphylloidei Singer, whose taxa are characterized by having pilepellis composed of a mixture of smooth cells and rotalis-type broom cells, absence of distinct collarium, marasmoid or collybioid basidiomes, filiform and insititious 346 ... Işıloğlu & al. Figs. 2–5. Marasmius castaneophilus (from holotype). 2. spores, 3. pleurocystidia, 4. cheilocystidia, 5. pileipellis stem, white or pale pileus, vein-like and reduced gills, and non-dextrinoid hyphae. It is closely related to M. epiphylloides (Rea) Sacc. & Trotter and can be distinguished confidently both morphologically and microscopically. Marasmius castaneophilus has a longer hair like stem, larger basidiospores, and two types of cheilocystidia. It also differs by its association with sweet chestnut husks. Acknowledgements The authors would like to express their thanks to Drs. Vladimír Antonín (Moravian Museum, Brno, Czech Republic) and Machiel E. Noordeloos (Rijksherbariım, Leiden) for reviewing the manuscript, to Ferah Yılmaz (Muğla University) for helping to collect the specimen and to Rabia Melike Işıloğlu (Muğla University) for helping to draw figures. This study was supported financially by Tübitak, The Scientific and Technical Research Council of Turkey (project no: TBAG-102T106). Marasmius castaneophilus sp. nov. (Turkey) ... 347 Literature cited Anon 2008. http://www.mycobank.org/MycoTaxo.aspx. Antonin V, Noordeloos ME. 1993. A Monograph of Marasmius, Collybia and Related Genera in Europe. Part 1: Marasmius, Setulipes, and Marasmiellus. Libri Botanici 8. IHW-Verlag, Eching. Moncalvo JM, Vilgalys R, Redhead SA, Johnson JE, James TY, Aime MC, HofstetterV, Verduin SJV, Larsson E, Baroni TJ, Thorn RG, Jacobsson S, Clémençon H, Miller OK. 2002. One hundred and seventeen clades of euagarics. Molecular Phylogenetic and Evolution 23: 357–400. Owings P, Desjardin DE. 1997. A molecular phylogeny of Marasmius and selected segregate genera. Inoculum 48(3): 29. Singer R. 1986. Agaricales in Modern Taxonomy. 4th ed. J. Cramer, Vaduz. Solak MH, Işıloğlu M, Kalmış E, Allı H. 2007. Macrofungi of Turkey, Checklist. Üniversiteliler ofset, İzmir. Watling R. 1982. Taxonomic Status and Ecological Identity in the Basidiomycetes. In Decomposer Basidiomycetes: their Biology and Ecology (eds. Frankland, Hedger, Swift). Pitman Press, Bath, UK. Wilson AW, Desjardin DE. 2005. Phylogenetic relationships in the gymnopoid and marasmioid fungi (Basidiomycetes, euagaric clade). Mycologia 97(3): 667–679..
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